Malicious PDF — malware analysis report

Static analysis result for SHA-256 a689edce3663dc0e…

MALICIOUS

PDF

78.4 KB Created: 2021-03-20 07:49:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9e168c132cef0db2b5452dc9b2ec4004 SHA-1: d09cc4c170a6d65f6bb844c57b2bad8afc690f7b SHA-256: a689edce3663dc0ed5bcb1576033125d9119c9b34897e27516237a84e39cbeab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute content via link farms. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/wix?keyword=earthquake+zones+worksheet+answers PDF link annotation
    • http://xexogafuko.22web.org/femirazamosorasab.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/your_own_market_stall_skyrim.pdfIn PDF document text
    • http://datujizid.iblogger.org/organogram_template_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/gobefuvumi/hfrtOhc/digi_prepaid_payment_history.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5fdc57f308fe3.pdfIn PDF document text
    • http://theandyhong.com/how_to_open_honeywell_thermostat_to_replace_batterysnjkr.pdfIn PDF document text
    • http://robertferrell.net/34917925517z7cp8.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/descargar_el_pianista_latino_hd_utorrent5ugmw.pdfIn PDF document text
    • http://romeita.space/mijexiganaxemo4g3ro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387703/normal_5fedd1be69c06.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/igBjige/limewapofosurepop.pdfIn PDF document text
    • http://premiumpornclips.com/android_service_onstartcommand_not_called8l4ju.pdfIn PDF document text
    • https://cdn.sqhk.co/sisamide/Ehfohbu/kim_kardashian_hollywood_hack_android_2020.pdfIn PDF document text
    • http://tehnoprom.org/tuvumipidokixewanodojsmi0y.pdfIn PDF document text
    • http://idealicaitalia.website/hero_of_the_rails_ds_gamem9idy.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/jjbhdUo/chicken_run_ideas_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://regipikiwubadov.epizy.com/answers_applied_statistics_and_probability_for_engineers.pdfIn PDF document text
    • http://sasaxunofob.atwebpages.com/sikagozitirub.pdfIn PDF document text
    • http://rokabimokow.rf.gd/36428736619.pdfIn PDF document text
    • http://xesawufozimiki.epizy.com/sepogudolazaran.pdfIn PDF document text
    • http://roveramo.atwebpages.com/fundamentals_of_financial_accounting_4th_edition.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 5032 bytes
SHA-256: b1a3ea25257385a7ab5371839d0368168b509410b1a935889b793b3641fdf736
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 10948 bytes
SHA-256: f0f7eafb2974a3cdaed8859b70ea3ff7f9b44b8b14f08c8417f229c645ca5077

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